Abstract

The kinetic energy distribution of coincident fragments from spontaneous fission of $^{257}\mathrm{Fm}$ has been measured with silicon detectors. The data reveal two significant features: (1) The mass-yield distribution is markedly more symmetric than for slightly lighter nuclei (e.g., $^{252}\mathrm{Cf}$, $^{254}\mathrm{Cf}$); (2) the average total kinetic energy increases monotonically with the approach to symmetric fission.

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